| Autor: |
Gao, Wenxian, Wang, Guangjiang, Li, Xinjian, Hu, Xing, Song, Hongzhang |
| Předmět: |
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| Zdroj: |
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics; 3/10/2017, Vol. 31 Issue 6, p-1, 9p, 1 Black and White Photograph, 6 Graphs |
| Abstrakt: |
In this work, BiNaBa2Co2O (=0.00, 0.05, 0.10, 0.15, 0.20, 0.25 and 0.30) ceramic samples were prepared by the conventional solid phase method. The influence of Na element doping on the thermoelectric properties of samples was investigated from 300 K to 950 K. Compared with undoped sample, the Seebeck coefficients of Na-doped samples have only a slight decrease. While, the electrical resistivity of the Na-doped samples reduces, for BiNaBa2Co2O ceramic samples with 0.15, the electrical resistivity decreases with increasing Na doping amounts due to the hole-doping effect. In addition, its temperature-dependent resistivity exhibits metallic electrical conductivity behavior. While, the samples with 0.20 exhibit semiconductor electrical conductivity behavior at the temperature range of 473-823 K, because of the significant reduction of the electrical resistivity and the slight decrease of Seebeck coefficients, the power factors of the doped samples get a significant improvement. For the most suitable doped sample BiNaBa2Co2O, its ZT value can reach a better value of 0.2 at 873 K. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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